Port the maia reader to dask/xarray

[mraspaud]

• Tests passed
• Passes git diff origin/develop **/*py | flake8 --diff

[coveralls]

Coverage increased (+0.6%) to 65.117% when pulling 93c6915 on fix-maia-reader into 861c372 on develop.

[codecov-io]

Codecov Report

Merging #281 into develop will increase coverage by 0.63%.
The diff coverage is 13.63%.

@@            Coverage Diff             @@
##           develop    #281      +/-   ##
==========================================
+ Coverage    64.47%   65.1%   +0.63%     
==========================================
  Files          114     115       +1     
  Lines        13997   14493     +496     
==========================================
+ Hits          9024    9436     +412     
- Misses        4973    5057      +84

Impacted Files	Coverage Δ
satpy/resample.py	50.15% <0%> (ø)	⬆️
satpy/readers/maia.py	19.27% <14.28%> (-1.21%)	⬇️
satpy/tests/reader_tests/test_clavrx.py	95.83% <0%> (ø)
satpy/readers/native_msg_hdr.py	28.72% <0%> (+0.01%)	⬆️
satpy/tests/reader_tests/__init__.py	96.29% <0%> (+0.29%)	⬆️
satpy/tests/test_yaml_reader.py	99.05% <0%> (+0.47%)	⬆️
satpy/readers/file_handlers.py	88.67% <0%> (+0.92%)	⬆️
satpy/readers/native_msg.py	21.85% <0%> (+2.17%)	⬆️
satpy/readers/yaml_reader.py	87.91% <0%> (+2.36%)	⬆️
satpy/tests/reader_tests/test_hdf4_utils.py	96.2% <0%> (+4.97%)	⬆️
... and 2 more

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